/Engine/Source/Runtime/Experimental/Chaos/Public/Chaos/Evolution/ConstraintGroupSolver.h
There will only be one (or zero)FPBDSceneConstraintGroupSolverper simulation world.
class FPBDSceneConstraintGroupSolver : public [Chaos::Private::FPBDConstraintGroupSolver](API\Runtime\Chaos\Chaos\Evolution\FPBDConstraintGroupSolver)